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Group the people in sets, including 3 people of marketing and 11 people of sales to each group.
The number of people in each group will be 3 + 11 = 14,
and the number of groups is 210/14 = 15.
Hence, there are 3*15 = 45 persons in marketing and 11*15 = 165 people in sales. ANSWER
Solved.